Unable To Turn Off Database Flashback(from metalink)

Applies to:

Oracle Server - Enterprise Edition - Version: 10.2.0.2
This problem can occur on any platform.

Symptoms

there are problems with flashback database, however, unable to turn off flashback database so that
the database can be opened:
SQL> alter database flashback off;

Database altered.

SQL> alter database open;
alter database open
*
ERROR at line 1:
ORA-38760: This database instance failed to turn on flashback database
.

Cause

there is a restore point in the database

checked v$restore_point
.

Solution

check whether restore points exist:
SQL> select flashback_on from v$database;
SQL> select name from v$restore_point;

If so, drop them:
SQL> drop restore point <name>;
SQL> alter database flashback off;
SQL> select flashback_on from v$database;
SQL> alter database open;